An interpretation of the findings is that attention has a facilitating effect for auditory processing, causing reduced activation in the primary auditory cortex when attention is explicitly recruited. The musical instrument stimuli mainly activated areas in visual association cortex, cerebellum, and the hippocampus. The CV‐syllables activated areas corresponding to the classic language areas of Broca and Wernicke. ![]() Concentrating on either the right or left ear stimulus significantly decreased activity bilaterally in the temporal lobes compared to concentrating on both ear stimuli, at the expense of an increased activation in the right posterior and inferior superior parietal lobe. Brain activation was measured with 15O‐PET, and significant changes in regional normalized counts (rNC) were evaluated using statistical parametric mapping (SPM96) software. The subjects were instructed to either concentrate on the stimuli presented in both ears, or only on the left or right ear stimulus. The target stimulus appeared an equal number of times in the left and right ear. Twelve subjects listened to lists of consonant‐vowel syllables, or short musical instrument passages, with the task of detecting a “target” syllable or musical instrument by pressing a button. Two different stimuli were presented simultaneously, one in each ear. Dichotic listening is a technique to study laterality effects in the auditory sensory modality. The present study investigated the effect of attention on brain activation in a dichotic listening situation.
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